Sagen was formerly part of the German Empire. In the German Empire, the place was called Sagen.
The place is now called Bzowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sagen | German Empire | Czarnikau | before the Versailles Treaty |
| Bzowo, Dwór | Poland | Czarnków | after the Versailles Treaty |
| Sagen | German Empire | Scharnikau (Wartheland) | 1939 |
| Bzowo | Poland | Czarnków | 1945 |
| Bzowo | Poland | Piła | 1992 |